Topic
Jet mill
About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.
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TL;DR: In this paper, a study for in-line particle size measurement using laser diffraction is presented to improve operation control of a 10-inch spiral jet mill pilot plant with alpha-Al2O3 as test material.
Abstract: Jet milling is suitable for the production of very fine powders with a well-defined particle size distribution (PSD). The major disadvantage of the process is the poor energy efficiency. In practice jet mills have to be operated below their maximum capacity in order to avoid the production of off-specification material, due to operation disturbances. Therefore, it is important to automate operation with a real-time PSD instrument for quality control. In this paper, a study for in-line particle size measurement using laser diffraction is presented to improve operation control. This measurement system uses a novel CMOS pixel array, which has a robust and flexible feature for the application. It also includes an in-line cell system, where direct measurement is implemented in the product particle stream coming from the mill and an air purge for the cell window allows continued operation. Experiments were conducted on a 10-inch spiral jet mill pilot plant with alpha-Al2O3 as test material. The milling process is investigated by varying the operational conditions. The measurement results are useful to build a grinding model for control purpose.
7 citations
Patent•
20 Aug 2002
TL;DR: In this paper, a closed particle feed apparatus is used to prevent the backflow of dust-loaded air that occurs in a milling system formed by combining a jet mill and an open particle feed.
Abstract: A particle feed apparatus is combined with a jet mill and has a particle feeder for feeding particles to an air injector that injects particles together with particle carrying air into the jet mill. The particle feed apparatus is a closed structure isolated from the environment. The use of the closed particle feed apparatus prevents the backflow of dust-loaded air that occurs in a milling system formed by combining a jet mill and an open particle feed apparatus. The use of the closed particle feed apparatus improves the working environment, enhances the milling ability of the jet mill and facilitates operations.
7 citations
TL;DR: In this article, the particle size distributions (PSDs) of the product flow and the solid concentration below the classifier were determined on-line and in-line by a high-speed camera and measurements of the mill inventory and its PSD were performed.
7 citations
Patent•
16 Apr 2013
TL;DR: In this paper, the authors present an approach for the micronization of a powdered material (P) containing particles, comprising of a container containing a reserve of the powdered product (P), to be micronized; a high-energy gaseous spiral fluid-jet micronising mill with which powdered product is micronised; and a feed system (13) to feed powdered product from container to the spiral jet mill (12), wherein feed system comprises a special microdispenser device (20, 21, 26, 27, 28 and 29) that mic
Abstract: Apparatus (10) for the micronisation of a powdered material (P) containing particles, comprising: a container (11), containing a reserve of the powdered product (P) to be micronised; a high-energy gaseous spiral fluid-jet micronising mill (12) with which powdered product (P) is micronised; and a feed system (13) to feed powdered product (P) from container (11) to the spiral jet mill (12), wherein feed system (13) comprises a special microdispenser device (20, 21, 26, 27, 28, 29) that micrometrically dispenses and directly feeds the powdered material (P), in a dense state, to the spiral jet mill (12), and wherein said microdispenser device (20) comprises one or more dispensing sections (21) which are cyclically filled with material originating from container (11) and then emptied to feed the material to the spiral jet mill (12), opening and closing at high frequency a plurality of control valves (26, 27, 28 and 29) associated with the dispensing sections (21) of the microdispenser device (20).
7 citations
TL;DR: In this paper, a short description of a method for determining the internal energy increase of material due to enlarging its surface area in a comminution process is given, and an exergy balance of the comminutions of a solid substance, has been discussed.
7 citations